Method and means for removing carbon deposits from engine cylinders



Patented Aug. 27, 1929.

UNITED STATES PATENT OFFICE.

CARROLL ALONZO HOCHWALT, F DAYTON, OHIO, ASSIGNOR TO GENERAL MOTORS JRESEARCH CORPORATION, OF DAYTON,

OHIO, A CORPORATION OF DELAWARE.

METHOD AND MEANS FOR REMOVING CARBON DEPOSITS FROM ENGINE CYLINDERS.

No Drawing.

This invention relates to the removal of carbon-like deposits from. the cylinder of an internal-combustion engine. These deposits usually comprise dust, carbon and a binder consisting of a tarry-like mixture. The principal objects of the present invention are to provide a method and means which efiectively remove the tarry-like binder and cleans the carbon deposit from the metal parts of an en- 'gine.

\ I have found that furfuraldehyde used alone or mixed with a solvent of the type used for dissolving varnish readily removes carbon deposits.

My preferred carbon removing compound comprises, by weight, 7 parts furfuraldehyde, 3 parts naphthalene, 8 parts benzol, and 6 parts denatured alcohol. These are mixed, about cc. of the mixture placed in a hot cyl- 0 inder, the engine is turned over several times by hand or by a starting motor and the engine then left idle for several hours or for over night. When the engine is started the loose carbon is blown out the exhaust.

The composition is varied by changing the roportions, by employing only furfuraldeyde, alcohol or the furfuraldehyde and ben- Application filed September 18, 1923. Serial No. 663,487.

gel, in which case the parts, by weight, given in the example, may be employed, and by substituting for the benzol and alcohol or other solvents for varnish.

If the carbon deposit is light or soft, the furfuraldehyde ma be employed alone. We prefer to use fur uraldehyde, alcohol and benzol, the naphthalene being added, if desired, to assist in cleaning the metal parts.

I claim:

1. A composition of matter comprising by weight substantially 7 parts furfuraldehyde,

3 parts naphthalene, 8 parts benzol and 6 40 parts denatured alcohol. a

'2. The process of cleaning an internal-combustion engine cylinder having a carbon deposit which comprises loosening the deposit with a mixture of furfuraldehyde, naphthalene, benzol, and denatured alcohol; and removing the deposit. I

3. A composition of matter for removing carbon deposits from an engine cylinder comprising furfuraldehyde, alcohol and benzol. .60

In testimony whereof I hereto aflix my signature.

CARROLL ALONZO HOCHWALT. 

